class_docstr: Blocks class to help creating the blocks.
code: def __getitem__(self, block_type):
      return _block_builders[block_type]
  
file_path: model_search/model_search/block_builder.py
imports: import enum
  from model_search import block
  from model_search import registry
  from model_search.hparams import hyperparameters
label_desc: Use image node_id 2 for calling the Blocks obj's underlying member method code with example usage: obj.__getitem__(block_type) and returns: _block_builders